A forming process for direct spinning of 6000D and above fibers

Abstract

The application provides a forming process for directly spinning fibers of 6000D or more, and belongs to the technical field of high-performance fibers. Polyester chips are used as raw materials, the polyester chips are added into a screw extruder for melt spinning, a plurality of spinnerets corresponding to the screw extruder respectively extrude protofilaments, the protofilaments enter a drafting and heat setting process and winding to obtain fiber products of 6000D or more. The application can realize direct forming of fibers of 6000D or more, such as 6000D, 7000D, 8000D and 9000D, without doubling, and has the advantages of short process route, short cycle, low energy consumption, low cost, high breaking strength and the like.

Description

Technical Field

[0001] This application relates to a molding process for directly spinning fibers with a density of 6000D or higher, which belongs to the field of high-performance fiber technology. Background Technology

[0002] In the process of forming industrial yarn, most manufacturers can directly spin industrial yarn up to 6000D from the spinning machine. To produce industrial yarn with a density of 6000D or higher, it is necessary to complete the process through spinning, plying (also known as twisting), network bundling, drawing, heat setting, and winding. To obtain industrial yarn with a density of 8000D, 1000D precursor yarn is first spun, and then eight strands of 1000D precursor yarn are plyed together, or four strands of 2000D precursor yarn are plyed together, or two strands of 4000D precursor yarn are plyed together.

[0003] In the above process, the more times the raw yarn is plied together and the more strands involved, the greater the strength loss and the worse the uniformity of breaking strength. This is because, for 1000D / 192f raw yarn, during the pliing of 8 strands, due to uneven tension and other reasons, the 192*8 fibers in the 8 strands are not uniform, resulting in uneven fiber breakage after pliing. At the same time, in order to increase fiber cohesion, compressed air is needed for networking. Depending on the yarn / raw yarn thickness, the networking pressure is controlled at around 2.5kg, which exacerbates fiber strength loss and fuzzing. The strength of the finished 6000D yarn is less than 8.0cN / dtex, and the strength of the finished 8000D yarn is less than 7.9cN / dtex. Meanwhile, the winding speed is only 150~1200m / min, which leads to an additional increase in production cycle, cost and power consumption. Taking the production of 8000D from 10kg of 1000D raw yarn in parallel with 8 strands as an example, it takes 1000 minutes to produce one ton of 8000D product if one machine is running in parallel, and 500 minutes if two machines are running in parallel. The additional costs for packaging, labor, electricity consumption and equipment depreciation are about 1000~2000 yuan per ton, and each ton of product requires about 400 kWh of electricity. Summary of the Invention

[0004] In view of this, this application provides a molding process for directly spinning fibers of 6000D and above, which can directly form fibers of 6000D and above, such as 6000D, 7000D, 8000D, and 9000D, without the need for secondary processing of spinning. It has the advantages of short process route, short cycle, low energy consumption, low cost, and high breaking strength.

[0005] Specifically, this application is implemented through the following scheme: A molding process for directly spinning fibers with a density of 6000D or higher involves using polyester chips as raw material. The polyester chips are added to a screw extruder for melt spinning. Multiple spinnerets corresponding to the screw extruder extrude raw yarns, which then enter the drawing, heat setting, and winding processes to obtain finished fibers with a density of 6000D or higher.

[0006] The stretching process is carried out between five pairs of rollers arranged in sequence, which are respectively GR1+2, GR3+4, GR5+6, GR7+8, and GR9+10; The heat setting is performed between a pair of rollers, denoted as GR11+12; In the screw extruder, the temperature of zone 1 is 305~315 ℃, the temperature of zone 2 is 310~320 ℃, the temperature of zone 3 is 300~312 ℃, and the temperature of zones 4, 5 and 6 is 285~303 ℃. The draw ratio in the drawing process is 5.80~6.70; A pre-network is set between GR1+2 and GR3+4, and the raw yarn is first twisted at the pre-network. The second twist is performed between GR7+8 and GR9+10. A main network is set between GR11+12 and the winding head, and the heat-set fiber is twisted for the third time at the main network. The pre-network voltage is 1.0~4.0 bar; The rotational speed of the GR11+12 is 2620~2750 m / min, and the temperature is 150~160 ℃; The network voltage of the main network is between 2.0 and 6.0 bar; The winding speed is 2500~2800 m / min, the tension is 1000~2000 cN, the surface pressure is controlled at 100~200N, and the traverse movement adopts a fork type.

[0007] In the above scheme, the direct spinning of fibers with a density of 6000D or higher is carried out by screw extrusion melt spinning-pre-networking-drawing-heat setting-main networking-winding. This allows the melt-spun fibers to undergo the same networking, drawing, heat setting and winding processes without secondary processing, and the resulting finished product is a fiber with a density of 6000D or higher.

[0008] Furthermore, as a preferred option: The heating jacket on the screw extruder is a nano-far-infrared heating jacket. The nano-far-infrared heating jacket includes an outer cylinder and a heating coil. The heating coil is installed on the inner wall of the outer cylinder, which has a cavity. The inner wall communicates with the cavity. The heating coil includes a nano-far-infrared electric heating generator, a reflective layer, a heat insulation layer, a shell, and a heat-resistant radiation coating. The reflective layer, heat insulation layer, shell, and heat-resistant radiation coating are sequentially arranged from the inside out around the nano-far-infrared electric heating generator. More preferably: The outer cylinder is made of 310S metal shell.

[0009] The nano-infrared electric heating generator uses a quartz far-infrared radiation tube to emit far-infrared rays and a nano-alloy wire as a heating element. The combination of the two achieves better heat absorption.

[0010] The reflective layer is a mirror-finished 323 or 310S stainless steel plate, which directly radiates the heated object in one direction.

[0011] The insulation layer uses aerospace-grade aerogel felt or 1430 ceramic fiber felt to achieve heat preservation while preventing heat from dissipating from the interior of the insulation layer.

[0012] The outer casing is made of 304 stainless steel.

[0013] The heat radiation protection coating is made of titanium dioxide nano-coating.

[0014] The heating jacket with the above-described structure has two beneficial effects: Firstly, the heating jacket of this application changes the heat transfer method from the traditional solid-to-solid heat transfer to a dual-effect heating of solid-to-solid heat transfer between the heating coil and the outer shell plus air radiation within the cavity, improving the heat transfer efficiency by 88-93% compared to traditional solid-to-solid heat transfer, and ensuring precise and stable temperature control in each zone of the screw extruder. Secondly, heating jackets using traditional solid-to-solid heat transfer methods use thin insulation cotton, resulting in surface temperatures as high as 150-250°C, a service life of less than one year, and a static heat preservation energy consumption of 0.580 kWh for half an hour, a heating energy consumption of 2.706 kWh, and a heating energy consumption of 0.260 kWh. The overall energy consumption ratio of the screw extruder per kilogram of polyester chips is 0.370 kWh / kg polyester chips. In contrast, the structure of the heating coil in this application keeps the surface temperature of the heating jacket below 50°C, significantly improving the workshop working environment, allowing for continuous use for more than 25,000 hours, and extending the service life of the heating coil by 200%. With an energy consumption of over 90%, static heat preservation energy consumption for half an hour is reduced to approximately 0.264 kWh, heating energy consumption is reduced to approximately 2.062 kWh, and heating energy consumption is reduced to around 0.134 kWh. The overall energy consumption ratio of the screw extruder corresponding to each kilogram of polyester chips is reduced to 0.350 kWh, and the energy saving rate reaches 60-85%.

[0015] In the drawing process, the temperature and speed of each roller are set as follows: GR1+2: 420~440 m / min, room temperature; GR3+4: 430~450 m / min, 70~80 ℃; GR5+6: 450~470 m / min, 90~100 ℃; GR7+8: 1700~1900 m / min, 110~130 ℃; GR9+10: 2600~2800 m / min, 200~220 ℃.

[0016] The winding angle is 7.0~10.0°; the traverse fork is trilobed, with a thickness of 1~6mm and a stroke of 240~270mm. The traverse speed setting positively alters the winding angle, ensuring good package formation and resulting in a high-quality formed yarn cake with a high denier. More preferably, the fork is a ceramic fork and / or has a silica coating on its surface, effectively reducing friction during the winding process and minimizing damage to the yarn.

[0017] A cooling air vent is provided below the winding head. The air temperature of the cooling air vent is 10~30℃, the air speed is 0.95~0.98 m / s, and the air pressure is 500~1000 Pa, which blows and cools the yarn cake. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0019] Figure 1 This is a schematic diagram of the heating coil in this application.

[0020] Figure 2 This is a schematic diagram of the fork structure in this application.

[0021] The following are the labels in the diagram: 1. Nano infrared electric heating generator; 2. Reflective layer; 3. Heat insulation layer; 4. Outer shell; 5. Heat radiation protection coating; 6. Shift fork; 61. Guide wire plate. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the technical solutions in the embodiments of this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit the technical solutions of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0023] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or position shown in the accompanying drawings, and are only for ease of description and should not be construed as limiting the present technical solution.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features. "A plurality of" means two or more, unless otherwise explicitly defined.

[0025] Example 1

[0026] This application provides a forming process for directly spinning 6000D polyester industrial yarn. The embodiments of this application are described below with reference to the accompanying drawings.

[0027] (1) The parameter settings for the screw extruder are as follows: The component size is 0.6*0.78, and the filter element size is 2*192 (60 μ).

[0028] The temperature in Zone 1 is 315 ℃, the temperature in Zone 2 is 320 ℃, the temperature in Zone 3 is 310 ℃, and the temperature in Zones 4, 5 and 6 is 303 ℃.

[0029] The screw speed is 18.5 rpm.

[0030] The temperature of the biphenyl furnace is 305 ℃.

[0031] The pressure before the pump is 66.3 bar, and the pressure after the pump is 288.2 bar.

[0032] (2) A side blower is installed below the spinneret of the screw extruder. The side blower temperature is 19 ℃, the humidity is 86%, the wind speed is 0.95 m / s, and the wind pressure is 800 KPa.

[0033] As a preferred example, the heating jacket on the screw extruder adopts a nano-far-infrared heating jacket. The nano-far-infrared heating jacket includes an outer cylinder and an electric heating ring. The outer cylinder is fitted onto the screw extruder, while the electric heating ring is installed on the inner wall of the outer cylinder. The outer cylinder has a cavity, and the inner wall is connected to the cavity. Solid-state heat conduction is formed between the outer cylinder and the electric heating ring. At the same time, the heat from the electric heating ring enters the cavity through air radiation to form air radiation heating. The combination of dual heating achieves more stable, effective and precise temperature control of the screw extruder.

[0034] The structure of the heating coil is as follows Figure 1As shown, it includes a nano-infrared electric heating generator 1, a reflective layer 2, a heat insulation layer 3, a shell 4, and a heat radiation protection coating 5. The reflective layer 2, the heat insulation layer 3, the shell 4, and the heat radiation protection coating 5 are arranged sequentially from the inside to the outside of the nano-infrared electric heating generator 1.

[0035] As a specific example, in the above structure, the outer cylinder uses a 310S metal shell. The nano-infrared electric heating generator 1 uses a quartz far-infrared radiation tube to emit far-infrared rays and uses nano-alloy wire as the heating element; the two work together to achieve better heat absorption. The reflective layer 2 is a mirror-finished 323 stainless steel plate, directly radiating heat to the heated object in one direction. The heat insulation layer 3 uses aerospace-grade aerogel felt, achieving heat preservation while preventing heat energy from dissipating from the inside of the insulation layer. The outer shell 4 uses a 304 stainless steel shell. The heat radiation protection coating 5 uses a titanium dioxide nano-coating.

[0036] The filaments extruded from the spinneret are blown by the side air to obtain raw filaments.

[0037] (3) The five pairs of rollers in the drawing process are respectively GR1+2, GR3+4, GR5+6, GR7+8, and GR9+10.

[0038] GR1+2: 430 m / min, room temperature; GR3+4: 440 m / min, 75 ℃; GR5+6: 460 m / min, 95 ℃; GR7+8: 1740 m / min, 120 ℃; GR9+10: 2650 m / min, 210 ℃; The draw ratio is 6.16.

[0039] (4) The heat-setting roller is designated as GR11+12, with a rotation speed of 2620 m / min and a temperature of 153 ℃.

[0040] (5) The winding speed is 2550 m / min, and the tension is 1000 cN. (Combined) Figure 2 The fork 6 mounted on the wire guide plate 61 is a ceramic fork.

[0041] In the above process, the screw extruder is equipped with 8 spinnerets to melt-extrude 16 strands of raw filament. A pre-network is set between GR1+2 and GR3+4, with a pre-network pressure of 2.3 bar. The raw filament undergoes its first twisting at the GR3+4 roller, turning the 16 strands into 8 strands. A second twisting occurs at the ceramic part before the winding head at GR11+12, turning the 8 strands into 2 strands. A main network is set between GR11+12 and the winding head, with a main network pressure of 4.2 bar. The heat-set fiber undergoes its third twisting at the main network to obtain a 6000D fiber product.

[0042] In the above embodiments, The finished product of the above-mentioned 6000D fiber has a fineness of 6735.8 dtex, a breaking strength of 8.10 cN / dtex, a dry heat shrinkage rate of 7.2%, a network density of 5 cells / m, a breaking elongation of 16.2%, and an oil content of 0.53%.

[0043] Example 2

[0044] This application provides a forming process for directly spinning 8000D polyester industrial yarn. The embodiments of this application are described below with reference to the accompanying drawings.

[0045] (1) The parameter settings for the screw extruder are as follows: The component specifications are 0.5*1.0, and the filter element specifications are 2*144 (60 μ).

[0046] The temperature in Zone 1 is 310 ℃, in Zone 2 it is 315 ℃, in Zone 3 it is 312 ℃, and in Zones 4, 5 and 6 it is 302 ℃.

[0047] The screw speed is 18.0 rpm.

[0048] The temperature of the biphenyl furnace is 305 ℃.

[0049] The pressure before the pump is 86.5 bar, and the pressure after the pump is 250.9 bar.

[0050] (2) A side blower is installed below the spinneret of the screw extruder. The side blower temperature is 19 ℃, the humidity is 86%, the wind speed is 0.97 m / s, and the wind pressure is 800 KPa.

[0051] The filaments extruded from the spinneret are blown by the side air to obtain raw filaments.

[0052] (3) The five pairs of rollers in the drawing process are respectively GR1+2, GR3+4, GR5+6, GR7+8, and GR9+10.

[0053] GR1+2: 434 m / min, room temperature; GR3+4: 445 m / min, 75 ℃; GR5+6: 465 m / min, 95 ℃; GR7+8: 1800 m / min, 120 ℃; GR9+10: 2730 m / min, 209 ℃; The draw ratio is 6.28.

[0054] (4) The heat-setting roller is designated as GR11+12, with a rotation speed of 2710 m / min and a temperature of 155 ℃.

[0055] (5) The winding speed is 2600 m / min and the tension is 1400 cN.

[0056] In the above process, the screw extruder is equipped with 8 spinnerets to melt-extrude 16 strands of raw filament. A pre-network is set between GR1+2 and GR3+4 with a network pressure of 2.3 bar. The raw filament undergoes its first twisting at the pre-network, turning the 16 strands into 8 strands. Between GR3+4 and GR5+6, there are 8 strands, and between GR5+6 and GR7+8, there are 8 strands. Between GR7+8 and GR9+10, the 8 strands of raw filament are twisted into 4 strands. Between GR9+10 and GR11+12, 4 fibers are drawn. A main network is set between GR11+12 and the winding head with a network pressure of 3.5 bar. After heat setting, the fibers undergo a third twisting at the main network, turning the 4 strands of raw filament into 2 strands. Both of these strands are 8000D fiber products.

[0057] The finished 8000D fiber has a fineness of 8999.8 dtex, a breaking strength of 8.11 cN / dtex, a dry heat shrinkage rate of 7.2%, a network density of 5 cells / m, a breaking elongation of 14.7%, and an oil content of 0.70%.

[0058] Example 3

[0059] This application provides a forming process for directly spinning 9000D polyester industrial yarn. The embodiments of this application are described below with reference to the accompanying drawings.

[0060] (1) The parameter settings for the screw extruder are as follows: The component size is 0.6*0.78, and the filter element size is 2*192 (60 μ).

[0061] The temperature in Zone 1 is 315 ℃, the temperature in Zone 2 is 320 ℃, the temperature in Zone 3 is 310 ℃, and the temperature in Zones 4, 5 and 6 is 303 ℃.

[0062] The screw speed is 22 rpm.

[0063] The temperature of the biphenyl furnace is 305 ℃.

[0064] The pressure before the pump is 66.0 bar, and the pressure after the pump is 289 bar.

[0065] (2) A side blower is installed below the spinneret of the screw extruder. The side blower temperature is 19 ℃, the humidity is 86%, the wind speed is 0.95 m / s, and the wind pressure is 800 KPa.

[0066] The filaments extruded from the spinneret are blown by the side air to obtain raw filaments.

[0067] (3) The five pairs of rollers in the drawing process are respectively GR1+2, GR3+4, GR5+6, GR7+8, and GR9+10.

[0068] GR1+2: 420 m / min, room temperature; GR3+4: 435 m / min, 75 ℃; GR5+6: 465 m / min, 95 ℃; GR7+8: 1745 m / min, 125 ℃; GR9+10: 2660 m / min, 215 ℃; The draw ratio is 6.33.

[0069] (4) The heat-setting roller is designated as GR11+12, with a rotation speed of 2620 m / min and a temperature of 155 ℃.

[0070] (5) The winding speed is 2600 m / min and the tension is 1100 cN.

[0071] In the above process, the screw extruder is equipped with 8 spinnerets to melt-extrude 16 strands of raw filament. A pre-network is set between GR1+2 and GR3+4 with a network pressure of 2.5 bar. The raw filaments are twisted at GR3+4 and GR5+6, turning the 16 strands into 8 strands. A second twisting is performed between GR11+12 and the winding head ceramic part, turning the 8 strands into 2 strands. A main network is set between GR11+12 and the winding head with a network pressure of 4.5 bar. The heat-set fiber is twisted a third time at the main network to obtain a finished fiber with a density of 9000D.

[0072] The finished product of the above-mentioned 9000D fiber has a fineness of 9949.2 dtex, a breaking strength of 8.25 cN / dtex, a dry heat shrinkage rate of 7.0%, a network density of 4 cells / m, a breaking elongation of 16.6%, and an oil content of 0.78%.

[0073] Comparative Example 1

[0074] This comparative example provides a method for forming 6000D polyester industrial yarn by spinning three strands of 2000D precursor yarn in parallel.

[0075] Network stress: 3 bar Winding speed: 500m / min Spiral tubing diameter: 94mm Spiral tube length: 300mm Contact pressure: 3KG.

[0076] Comparative Example 2

[0077] This comparative example provides a method for forming 6000D polyester industrial yarn by spinning two strands of 3000D precursor yarn together.

[0078] Network stress: 3.5 bar Winding speed: 450m / min Spiral tube diameter: 94mm Spiral tube length: 300mm Contact pressure: 3.5KG.

[0079] Comparative Example 3

[0080] This comparative example provides a method for forming 8000D polyester industrial yarn by spinning eight strands of 1000D precursor yarn in parallel.

[0081] Network stress: 2.5 bar Winding speed: 550m / min Spiral tubing diameter: 94mm Spiral tube length: 300mm Contact pressure: 3.0KG.

[0082] Comparative Example 4

[0083] This comparative example provides a method for forming 8000D polyester industrial yarn by spinning two strands of 4000D precursor yarn in parallel.

[0084] Network stress: 3.8 bar Winding speed: 440m / min Spiral tubing diameter: 94mm Spiral tube length: 300mm Contact pressure: 3.6KG.

[0085] Table 1: Comparison of the effects of different implementation methods .

[0086] While both applications obtain 6000D wound yarn, this application uses a one-step direct spinning process. The 192*8 fibers of 6000D undergo the same networking, stretching, and heat setting processes, requiring no secondary processing. In contrast, Comparative Examples 1 and 2 require a doubling process, increasing manufacturing costs and power consumption. The more times and the more strands are doubled from the raw yarn, the greater the strength loss and the worse the uniformity of breaking strength. This is because, for doubling from 2000D or 3000D to 6000D, Comparative Examples 1 and 2 incur production costs 1500 yuan / ton more than Example 1 of this application, consume 400 kWh / ton more power, and require 2 hours more per ton of product, while maintaining a breaking strength below 8.0 cN / dtex.

[0087] Both examples yielded 8000D wound yarn. Example 2 used a one-step direct spinning process, where the 192*8 fibers of 8000D underwent the same networking, drawing, and heat setting processes without secondary processing. Comparative Examples 3 and 4, however, required a doubling process, increasing manufacturing costs and power consumption. For 1000D / 192f raw yarn, uneven tension during the doubling process resulted in uneven fiber distribution among the 192*8 fibers, leading to asynchronous fiber breakage after doubling. Furthermore, compressed air was used for networking to increase fiber cohesion, exacerbating fiber strength loss and fuzzing. Therefore, compared to Example 2, doubling from 1000D or 4000D to 8000D in Comparative Examples 3 and 4 incurred a production cost increase of 1500 yuan / ton, a power consumption increase of 400 kWh / ton, and an additional 2 hours of processing time per ton of product, while maintaining a breaking strength below 8.0 cN / dtex.

[0088] The above-described embodiments are merely illustrative of several feasible implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention, nor are the embodiments intended to limit the scope of protection in the claims of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. All equivalent implementations or changes that do not depart from the present invention should be included in the technology of the present invention.

Claims

1. A forming process for directly spinning fibers with a density of 6000D or higher, characterized in that: Using polyester chips with a viscosity of 1.00~1.30dL / g as raw material, the polyester chips are added to a screw extruder for melt spinning. Multiple spinnerets corresponding to the screw extruder extrude raw yarns, which then enter the drawing, heat setting and winding processes to obtain fiber products with a density of 6000D or higher. The stretching process is carried out between five pairs of rollers arranged in sequence, which are respectively GR1+2, GR3+4, GR5+6, GR7+8, and GR9+10; The heat setting is performed between a pair of rollers, denoted as GR11+12; In the screw extruder, the temperature of zone 1 is 305~315 ℃, the temperature of zone 2 is 310~320 ℃, the temperature of zone 3 is 300~312 ℃, and the temperature of zones 4, 5 and 6 is 285~303 ℃. The draw ratio in the drawing process is 5.80~6.70; A pre-network is set between GR1+2 and GR3+4, and the raw yarn is first twisted at the pre-network. The second twist is performed between GR7+8 and GR9+10. A main network is set between GR11+12 and the winding head, and the heat-set fiber is twisted for the third time at the main network. The pre-network voltage is 1.0~4.0 bar; The rotational speed of the GR11+12 is 2620~2750 m / min, and the temperature is 150~160 ℃; The network voltage of the main network is between 2.0 and 6.0 bar; The winding speed is 2500~2800 m / min, the tension is 1000~2000 cN, the surface pressure is controlled at 100~200N, and the traverse movement adopts a fork-type traverse movement.

2. The forming process for directly spinning fibers of 6000D or higher according to claim 1, characterized in that: The heating jacket on the screw extruder uses a nano-far-infrared heating jacket, which includes an outer cylinder and an electric heating coil. The heating coil is installed on the inner wall of the outer cylinder, and the outer cylinder has a cavity, with the inner wall communicating with the cavity. The heating coil includes a nano-infrared electric heating generator, a reflective layer, a heat insulation layer, a shell, and a heat radiation protection coating. The reflective layer, heat insulation layer, shell, and heat radiation protection coating are arranged sequentially from the inside to the outside of the nano-infrared electric heating generator.

3. The forming process for directly spinning fibers of 6000D or higher according to claim 2, characterized in that: The outer cylinder is made of 310S metal shell.

4. The forming process for directly spinning fibers of 6000D or higher according to claim 2, characterized in that: The nano-infrared electric heating generator uses a quartz far-infrared radiation tube to emit far-infrared rays and a nano-alloy wire as the heating element.

5. The forming process for directly spinning fibers of 6000D or higher according to claim 2, characterized in that: The reflective layer is made of mirror-finished 323 or 310S stainless steel plate, and the outer shell is made of 304 stainless steel.

6. The forming process for directly spinning fibers of 6000D or higher according to claim 2, characterized in that: The heat insulation layer is made of aerospace-grade aerogel felt or 1430 ceramic fiber felt, and the heat radiation protection coating is made of titanium dioxide nano-coating.

7. The forming process for directly spinning fibers of 6000D or higher according to claim 1, characterized in that, In the drawing process, the temperature and speed of each roller are set as follows: GR1+2: 420~440 m / min, room temperature; GR3+4: 430~450 m / min, 70~80 ℃; GR5+6: 450~470 m / min, 90~100 ℃; GR7+8: 1700~1900 m / min, 110~130 ℃; GR9+10: 2600~2800 m / min, 200~220 ℃.

8. The forming process for directly spinning fibers of 6000D or higher according to claim 1, characterized in that: The winding angle of the winding is 7.0~10.0°; the fork of the lateral movement is a three-lobed type, the fork thickness is 1~6mm, and the fork stroke is 240~270mm.

9. The forming process for directly spinning fibers of 6000D or higher according to claim 1, characterized in that: The fork-type lateral movement fork is a ceramic fork and / or has a silica coating on its surface.

10. The forming process for directly spinning fibers of 6000D or higher according to claim 1, characterized in that: A cooling air vent is provided below the winding head. The air temperature of the cooling air vent is 10~30℃, the air speed is 0.95~0.98 m / s, and the air pressure is 500~1000 Pa.

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